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<section id="sect-Reference_Guide-Setup_a_Gadget_Server">
	<title>Set up a Gadget Server</title>
	<section id="sect-Reference_Guide-Setup_a_Gadget_Server-Virtual_servers_for_gadget_rendering">
		<title>Virtual servers for gadget rendering</title>
		<para>
			&PRODUCT; recommends using two virtual hosts for security. If the gadget is running on a different domain other than the container (the website that &#39;contains&#39; the app), it is unable to interfere with the portal by modifying the code or cookies.
		</para>
		<para>
			An example would hosting the portal from <emphasis role="bold">http://www.sample.com</emphasis> and the gadgets from <emphasis role="bold">http://www.samplemodules.com</emphasis>.
		</para>
		<para>
			To do this, configure a parameter called <emphasis>gadgets.hostName</emphasis>. The value is the <emphasis>path/to/gadgetServer</emphasis> in <literal>GadgetRegisteryService</literal>:
		</para>
		
<programlisting language="xml">&#60;component&#62;
  &#60;key&#62;org.exoplatform.application.gadget.GadgetRegistryService&#60;/key&#62;
  &#60;type&#62;org.exoplatform.application.gadget.jcr.GadgetRegistryServiceImpl&#60;/type&#62;
  &#60;init-params&#62;
    &#60;value-param&#62;
      &#60;name&#62;gadgets.hostName&#60;/name&#62;
      &#60;description&#62;Gadget server url&#60;/description&#62;
      &#60;value&#62;http://localhost:8080/GateInGadgetServer/gadgets/&#60;/value&#62;
    &#60;/value-param&#62;
  &#60;/init-params&#62;
&#60;/component&#62;
</programlisting>
		<para>
			It is also possible to have multiple rendering servers. This helps to balance the rendering load across multiple servers.
		</para>
		<para>
			When deploying on the same server, ensure the gadget initiates before anything that calls it (for example; the webapp <literal>GateInGadgets</literal> which uses <literal>org.exoplatform.application.gadget.GadgetRegister</literal>).
		</para>
	</section>
	
	<section id="sect-Reference_Guide-Setup_a_Gadget_Server-Configuration">
		<title>Configuration</title>
		<section id="sect-Reference_Guide-Configuration-Security_key">
			<title>Security key</title>
			<para>
				A file called <emphasis role="bold">key.txt</emphasis> has to be generated for every installation of &PRODUCT; to be secure. This file contains a secret key used to encrypt the security token used for the user authentication.
			</para>
			<para>
				In the Linux systems, this file can be generated with:
			</para>
			
<programlisting><command>dd if=/dev/random bs=32 count=1 | openssl base64 &#62; /tmp/key.txt</command>
</programlisting>
		</section>
		
		<section id="sect-Reference_Guide-Configuration-Gadget_proxy_and_concat_configuration">
			<title>Gadget proxy and concat configuration</title>
			<para>
				These servers have to be on the same domain as the gadget server. You can configure the container in <filename>eXoGadgetServer:/WEB-INF/classes/containers/default/container.js</filename>.
			</para>
			
<programlisting language="javascript">&#34;gadgets.content-rewrite&#34; : {
  &#34;include-urls&#34;: &#34;.*&#34;,
  &#34;exclude-urls&#34;: &#34;&#34;,
  &#34;include-tags&#34;: [&#34;link&#34;, &#34;script&#34;, &#34;embed&#34;, &#34;img&#34;, &#34;style&#34;],
  &#34;expires&#34;: &#34;86400&#34;,
  &#34;proxy-url&#34;: &#34;http://localhost:8080/eXoGadgetServer/gadgets/proxy?url=&#34;,
  &#34;concat-url&#34;: &#34;http://localhost:8080/eXoGadgetServer/gadgets/concat?&#34;
},
</programlisting>
		</section>
		
		<section id="sect-Reference_Guide-Configuration-Proxy">
			<title>Proxy</title>
			<para>
				To allow external gadgets when the server is behind a proxy, add the following code to the beginning of the JVM:
			</para>
			
<programlisting>-Dhttp.proxyHost=proxyhostURL -Dhttp.proxyPort=proxyPortNumber -Dhttp.proxyUser=someUserName -Dhttp.proxyPassword=somePassword
</programlisting>
		</section>

	</section>

</section>


